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The Bahamas: Oceanic whitetip shark (Carcharhinus longimanus) in the waters off Cat Island in the Bahamas. Oceanic whitetips have been seriously over fished and their stocks have been dramatically reduced worldwide. They are a pelagic animal, living in the open ocean. This image is from Mission Critical.

Media photograph the Soyuz TMA-16M spacecraft is seen as it launches to the International Space Station with Expedition 43 NASA Astronaut Scott Kelly, Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) onboard Saturday, March 28, 2015, Kazakh time (March 27 Eastern time) from the Baikonur Cosmodrome in Kazakhstan. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. This image is from A Year in Space.

Correspondent Jessica Alba speaks with Climate Corp Fellows Brendan Edgerton, Jenise Young, and Scott Miller at The Honest Company offices, from the segment "Climate Corps." This image is from Years of Living Dangerously.

A scene from Continent 7: Antarctica, the first ever global long form documentary series filmed in Antarctica, coming this fall to National Geographic Channel. This image is from Continent 7: Antarctic.

A scene from Continent 7: Antarctica, the first ever global long form documentary series filmed in Antarctica, coming this fall to National Geographic Channel. This image is from Continent 7: Antarctic.

A scene from Continent 7: Antarctica, the first ever global long form documentary series filmed in Antarctica, coming this fall to National Geographic Channel. This image is from Continent 7: Antarctic.